Coil winding machines



Sept. 26, 1967 w. L. L. LENDx-:Rs

COIL WINDING MACHINES File-d Feb.' l0, 1966 INVENTOR. WILHEL MUS LL.LENDERS AGENT United States Patent fice 3,343,752 COIL WINDING MACHINES Wilhelmus Leonard Louis Lenders, Emmasingel, Eindhoven, Netherlands, assignor to North American Philips Company, Inc., New York, N.Y., a corporation of Delaware Filed Feb. 10, 1966, Ser. No. 526,564 Claims priority, application Ntherlands, Feb. 20, 1965, 65-2,1 6 3 Claims. (Cl. 242-9) ABSTRACT OF THE DISCLOSURE This disclosure involves a coil winding machine in which a motor drives a shaft which is separately connected to both a gear mechanism and a coil former support. A coil former is attached to the lsupport and coil wire is caused to be wound thereon -by a cam and guide means which are driven by the gear mechanism.

The invention relates to a coil winding machine comprising a main shaft, a coil former support connected with said shaft, a wire guide for the wire to be wound, a rotatable cam body controlling the wire guide relatively to the coil former so that the desired coil is obtained and a transmission mechanism between the main shaft and the cam body.

In coil winding machines the main shaft, i.e. the shaft on which the coil is wound, performs a given number of revolutions when the wire guide performs a single reciprocatory movement. The difference between the number of revolutions of the main shaft and of the cam body controlling the wire guide is obtained by means of a transmission mechanism. Accurate winding of coils, particularly with a small wire diameter gives rise to difficulties, since the main shaft with the coil former and the shaft with the cam body are capable of performing a slight axial movement, for example due to clearance and wear. Therefore winding coils of very thin wire often gives poor results due to the axial movements of the coil former and the cam -body relative to each other, even if this movement is very slight. Moreover, resilience due to inertia forces for example in the wire guide may be the cause of faulty winding.

The invention has for its object to provide a coil winding machine in which this disadvantage is obviated.

In a preferred embodiment of a machine according to the invention the cam for driving the wire guide is hollow and connected with a gear wheel journalled on the main shaft, the side of said wheel remote from the cam body bearing on a stop on the main shaft. The main shaft is surrounded by a spring, one end of which bears on the gear wheel and the other end on a shoulder of -a coil support arranged in line with the main shaft. This embodiment is structurally attractive and reliable in operation. This universal coil winding machine is of the type disclosed in my copending application Serial No. 526,619, filed Feb. l0, 1966.

The invention will be described in greater detail with reference to a preferred embodiment thereof illustrated in the accompanying drawing, in which:

FIGURE 1 is an elevational view, partly in section, of the coil winding machine according to the instant invention, and

FIGURE 2. is a perspective view of the wire guide and cam body connection. A

A motor 1 drives the main shaft 2, the end of which is provided with a coil former support 3. The main shaft 2 has a gear wheel 4, which engages a gear wheel 6, -rigidly secured to a shaft 5. The shaft 5 is furthermore provided with a gear wheel 7, which co-operates with 3,343,752 Patented Sept. 26, 1967 a gear wheel 8. The gear wheel 8, which may be made of a metal or a synthetic substance, is journalled at 9 on the main shaft 2. The overall transmission ratio of the gear wheels may be any determined value.

The gear wheel 8 has secured to it a hollow cam body 10, for example by means of screws 18. The cam body 10 governs, upon rotation, a wire guide 11, which is pivoted at 12 to part of the machine frame.

The wire guide 11 has a finger 13 with an aperture 14 for guiding the wire to be wound (not shown). The wire is wound on a coil former (not shown), arranged on the support 3 and bearing by one end on the shoulder 15 of the support 3. The support 3 is secured on shaft 2 by a threaded shaft 16 in a threaded lbore of the shaft 2 so that the shoulder 15 of the support 3- abutts against the enlarged end of the main shaft 2.

Between the shoulder 15 and the gear wheel 8 on the shaft is surrounded 'by a spring 17, which urges the gear wheel 8 against a stop 19, rigidly secured to the shaft 2. This stop is preferably formed by a steel disc having an annular, projecting rim 20, of which the portion facing the gear wheel 8 is smoothly finished, for example by lapping. The space 21 between the stop 19 and the gear wheel 8 may serve as a :lubricant container.

The ratio between the angularly velocity of the support 3 and of the cam body 10 controlling the wire guide depends upon the transmission ratio of the gear wheels 4, 6, 7 and 8. By the choice of the gear wheels the shape of the coil to be wound is fixed.

The coil former (not shown) is located on the support '3 and cannot move relatively to said support during winding. The cam body 10 is fixed to the gear wheel 8, which is urged by the spring 17 against the stop 19. The cam body 10 is therefore not displaceable in an axial direction. Between the coi-l former and the cam body controlling the wire guide no axial displacement can occur therefore. By choosing the diameter of the hollow cylindrical part of the cam body 10 acting upon the wire guide to be smaller than or equal to the diameter of the annular rim 20 of the stop 19, the cam will not tend to tilt due to local loads. The winding finger 13 moves accurately in accordance with a predetermined patte-rn with respect to the rotating coil former. It is thus possible to wind with extreme accuracy coils of a very thin wire, for example 40p diameter. Since, moreover, owing to the disposition of the cam body 10 around the main shaft 2 the distance between the wire guide portion co-operating with the cam body and the aperture 14 in the winding finger 13 is small, and since this part may be of rigid construction, resilience will not occur even in the case of comparatively heavy inertia forces. Therefore, the machine is capable of operating at high speed without adversely affecting winding accuracy.

It will be obvious that the support 3 may be connected with the main shaft 2 in a dif-ferent way than shown and that for example the shoulder 15 may be provided on a structural part located between the shaft 2 and the support 3.

While I have shown and described the preferred embodiment of my invention, it will be understood that the latter may be embodied otherwise than as herein specifically illustrated or described and that in the illustrated embodiment certain changes in the details of construction and in the arrangement of parts may be made without departing from the underlying idea or principle of the invention within the scope of the appended claims.

What is claimed as new and useful and desired to be secured by Letters Patent of the United States is:

1. In a coil winding machine having a main shaft and coil former means supported on said main shaft the improvement comprising, a wire guide, means mounting said wire guide for reciprocal movement in the axial direction of said coil former, a rotatably driven cam body means journalled on said main shaft, said cam body being coupled with said Wire guide for imparting movement thereto, a stop member fixed on said main shaft adjacent to and substantially coaxial with said cam body, and resilient means for continuously abutting said cam body means against said stop member for preventing relative axial movement between said cam body and the main shaft and coil former iixedly secured on said main shaft.

2. In a coil Winding machine according to claim 1 Wherein said cam body means comprises a hollow cylindrical member integrally connected with a gear Wheel for r0- tatably driving said member, said gear wheel being journalled on said main shaft, said gear wheel bearing against said stop member remote from said member, said resilient means surrounding said main shaft and abutting said gear Wheel at one end, the other end of said resilient means abutting against a shoulder iixed on said main shaft.

3. In a coil winding machine according to claim 2 wherein said stop member comprises a hollow body including a disc portion, an annular rim portion projecting axially from said disc portion, said disc portion and annular portion of said stop member and said gear wheel integral with said gear body deiining a lubricant container, said annular rim and said hollow cylindrical member having substantially equal diameters and being ycoaxial with one another.

References Cited UNITED STATES PATENTS FRANK J. COHEN, Primary Examiner.

N. L. MINTZ, Assistant Examiner. 

1. IN A COIL WINDING MACHINE HAVING A MAIN SHAFT AND COIL FORMER MEANS SUPPORTED ON SAID MAIN SHAFT THE IMPROVEMENT COMPRISING, A WIRE GUIDE, MEANS MOUNTING SAID WIRE GUIDE FOR RECIPROCAL MOVEMENT IN THE AXIAL DIRECTION OF SAID COIL FORMER, A ROTATABLY DRIVEN CAM BODY MEANS JOURNALLED ON SAID MAIN SHAFT, SAID CAM BODY BEING COUPLED WITH SAID WIRE GUIDE FOR IMPARTING MOVEMENT THERETO, A STOP MEMBER FIXED ON SID MAIN SHAFT ADJACENT TO AND SUBSTANTIALLY COAXIAL WITH SAID CAM BODY, AND RESILIENT MEANS FOR CONTINUOUSLY ABUTTING SAID CAM BOYD MEANS AGAINST SAID STOP MEMBER FOR PREVENTING RELATIVE AXIAL MOVEMENT BETWEEN SAID CAM BODY AND THE MAIN SHAFT AND COIL FORMER FIXEDLY SECURED ON SAID MAIN SHAFT. 